# lib/foundation/environment_detector.ex
defmodule Foundation.EnvironmentDetector do
  def detect_optimal_configuration() do
    %{
      environment: detect_environment(),
      infrastructure: detect_infrastructure(), 
      scale: detect_scale_requirements(),
      profile: determine_profile()
    }
  end
end

# lib/foundation/profiles.ex  
defmodule Foundation.Profiles do
  def get_profile(:development), do: development_profile()
  def get_profile(:production), do: production_profile()
  def get_profile(:enterprise), do: enterprise_profile()
end

# lib/foundation/configuration.ex
defmodule Foundation.Configuration do
  def configure_from_profile(profile) do
    # Automatically configure all tools based on profile
  end
end

# lib/foundation/strategies/mdns_lite.ex
defmodule Foundation.Strategies.MdnsLite do
  @behaviour Cluster.Strategy
  
  def start_link(opts) do
    # Configure mdns_lite for Foundation services
    configure_mdns_services()
    start_service_discovery()
  end
  
  defp configure_mdns_services() do
    MdnsLite.add_mdns_service(%{
      id: :foundation_node,
      protocol: "foundation",
      transport: "tcp",
      port: get_distribution_port(),
      txt_payload: [
        "node=#{Node.self()}",
        "foundation_version=#{Foundation.version()}",
        "capabilities=#{encode_capabilities()}"
      ]
    })
  end
end

# lib/foundation/development_cluster.ex
defmodule Foundation.DevelopmentCluster do
  def start_development_cluster() do
    # Automatic cluster formation for development
    discover_and_connect_nodes()
    setup_development_features()
  end
end

# lib/foundation/cluster_manager.ex
defmodule Foundation.ClusterManager do
  def start_clustering(config \\ :auto) do
    strategy = determine_clustering_strategy(config)
    configure_libcluster(strategy)
    start_cluster_monitoring()
  end
  
  defp determine_clustering_strategy(:auto) do
    cond do
      kubernetes_available?() -> 
        {Cluster.Strategy.Kubernetes, kubernetes_config()}
      consul_available?() -> 
        {Cluster.Strategy.Consul, consul_config()}
      dns_srv_available?() -> 
        {Cluster.Strategy.DNS, dns_config()}
      true -> 
        {Cluster.Strategy.Epmd, static_config()}
    end
  end
end

# lib/foundation/cluster_health.ex
defmodule Foundation.ClusterHealth do
  def monitor_cluster_health() do
    # Continuous cluster health monitoring
    # Automatic failover strategies
    # Performance optimization recommendations
  end
end

# lib/foundation/messaging.ex
defmodule Foundation.Messaging do
  def send_message(target, message, opts \\ []) do
    case resolve_target(target) do
      {:local, pid} -> send(pid, message)
      {:remote, node, name} -> send_remote(node, name, message, opts)
      {:service, service_name} -> route_to_service(service_name, message, opts)
      {:broadcast, topic} -> broadcast_message(topic, message, opts)
    end
  end
  
  def subscribe(topic, handler \\ self()) do
    Phoenix.PubSub.subscribe(Foundation.PubSub, topic)
    register_handler(topic, handler)
  end
end

# lib/foundation/pubsub_manager.ex
defmodule Foundation.PubSubManager do
  def configure_pubsub(profile) do
    case profile do
      :development -> configure_local_pubsub()
      :production -> configure_distributed_pubsub()
      :enterprise -> configure_federated_pubsub()
    end
  end
end

# lib/foundation/process_manager.ex
defmodule Foundation.ProcessManager do
  def start_distributed_process(module, args, opts \\ []) do
    strategy = determine_distribution_strategy(module, opts)
    
    case strategy do
      :singleton -> start_singleton_process(module, args, opts)
      :replicated -> start_replicated_process(module, args, opts)  
      :partitioned -> start_partitioned_process(module, args, opts)
      :local -> start_local_process(module, args, opts)
    end
  end
end

# lib/foundation/horde_manager.ex
defmodule Foundation.HordeManager do
  def start_child_with_retry(supervisor, child_spec, opts \\ []) do
    # Handle Horde's eventual consistency intelligently
    # Retry logic for failed registrations
    # Wait for registry sync when needed
  end
  
  def optimize_horde_performance(cluster_info) do
    # Adjust sync intervals based on cluster size
    # Optimize distribution strategies
    # Monitor and alert on consistency issues
  end
end

# lib/foundation/service_mesh.ex
defmodule Foundation.ServiceMesh do
  def register_service(name, pid, capabilities \\ []) do
    # Multi-layer registration for redundancy
    registrations = [
      register_locally(name, pid, capabilities),
      register_in_horde(name, pid, capabilities),
      announce_via_pubsub(name, pid, capabilities)
    ]
    
    validate_registrations(registrations)
  end
  
  def discover_services(criteria) do
    # Intelligent service discovery with multiple fallbacks
    local_services = discover_local_services(criteria)
    cluster_services = discover_cluster_services(criteria) 
    
    merge_and_prioritize_services(local_services, cluster_services)
  end
end

# lib/foundation/load_balancer.ex
defmodule Foundation.LoadBalancer do
  def route_to_service(service_name, message, opts \\ []) do
    instances = get_healthy_instances(service_name)
    strategy = determine_routing_strategy(instances, message, opts)
    
    route_with_strategy(instances, message, strategy)
  end
end

# lib/foundation/context.ex
defmodule Foundation.Context do
  def with_context(context_map, fun) do
    # Store context in process dictionary and telemetry
    # Automatic propagation across process boundaries
    # Integration with Phoenix.PubSub for distributed context
  end
  
  def propagate_context(target, message) do
    # Automatic context injection for all message types
    # Support for different target types (pid, via tuple, service name)
    # Context compression for large payloads
  end
end

# lib/foundation/distributed_debugging.ex  
defmodule Foundation.DistributedDebugging do
  def enable_cluster_debugging() do
    # Integration with ElixirScope for distributed debugging
    # Automatic trace correlation across nodes
    # Performance profiling across cluster
  end
end

# lib/foundation/cache_manager.ex
defmodule Foundation.CacheManager do
  def configure_cache(profile) do
    case profile do
      :development -> configure_local_cache()
      :production -> configure_distributed_cache()
      :enterprise -> configure_multi_tier_cache()
    end
  end
  
  def get_or_compute(key, computation_fn, opts \\ []) do
    # Intelligent cache hierarchy
    # Automatic cache warming
    # Distributed cache invalidation
  end
end

# lib/foundation/state_synchronization.ex
defmodule Foundation.StateSynchronization do
  def sync_state_across_cluster(state_name, initial_state) do
    # CRDT-based state synchronization
    # Conflict resolution strategies
    # Partition tolerance
  end
end

# lib/foundation/performance_optimizer.ex
defmodule Foundation.PerformanceOptimizer do
  def optimize_cluster_performance() do
    cluster_metrics = collect_cluster_metrics()
    optimizations = analyze_and_recommend(cluster_metrics)
    apply_safe_optimizations(optimizations)
  end
  
  def adaptive_scaling(service_name) do
    # Predictive scaling based on metrics
    # Automatic process distribution adjustment
    # Resource utilization optimization
  end
end

# lib/foundation/telemetry_integration.ex
defmodule Foundation.TelemetryIntegration do
  def setup_comprehensive_monitoring() do
    # Cluster-wide telemetry aggregation
    # Performance trend analysis
    # Automatic alerting on anomalies
    # Integration with external monitoring systems
  end
end

# lib/foundation/federation.ex
defmodule Foundation.Federation do
  def federate_clusters(clusters, strategy \\ :mesh) do
    case strategy do
      :mesh -> create_mesh_federation(clusters)
      :hub_spoke -> create_hub_spoke_federation(clusters)
      :hierarchical -> create_hierarchical_federation(clusters)
    end
  end
  
  def send_to_cluster(cluster_name, service_name, message) do
    # Cross-cluster communication
    # Routing strategies for different cluster types
    # Fallback mechanisms for cluster failures
  end
end

# lib/foundation/cluster_registry.ex
defmodule Foundation.ClusterRegistry do
  def register_cluster(cluster_name, config) do
    # Multi-cluster service registry
    # Cross-cluster service discovery
    # Global load balancing
  end
end

# Integration with ElixirScope
defmodule ElixirScope.Foundation.Integration do
  def enable_distributed_debugging() do
    Foundation.DistributedDebugging.register_debug_service()
    setup_cluster_wide_tracing()
  end
  
  def trace_across_cluster(trace_id) do
    Foundation.Messaging.broadcast(
      "elixir_scope:tracing",
      {:start_trace, trace_id, Foundation.Context.current_context()}
    )
  end
end

# Integration with DSPEx  
defmodule DSPEx.Foundation.Integration do
  def distribute_optimization(program, dataset, metric) do
    # Use Foundation's process distribution for AI workloads
    workers = Foundation.ProcessManager.start_process_group(
      DSPEx.Worker,
      strategy: :distributed,
      count: Foundation.Cluster.optimal_worker_count()
    )
    
    Foundation.WorkDistribution.coordinate_work(workers, dataset, metric)
  end
end

# lib/foundation/production_readiness.ex
defmodule Foundation.ProductionReadiness do
  def validate_production_config(config) do
    # Configuration validation
    # Security best practices checking
    # Performance baseline establishment
    # Capacity planning recommendations
  end
  
  def health_check() do
    # Comprehensive cluster health assessment
    # Service availability verification
    # Performance benchmark validation
  end
end

# lib/foundation/migration_helpers.ex
defmodule Foundation.MigrationHelpers do
  def migrate_from_libcluster(current_config) do
    # Seamless migration from plain libcluster
    # Configuration transformation
    # Zero-downtime upgrade path
  end
  
  def migrate_from_swarm(current_config) do
    # Migration path from Swarm to Foundation
    # Process migration strategies
    # Data preservation techniques
  end
end

# mix.exs
defp deps do
  [
    # Core clustering
    {:libcluster, "~> 3.3"},
    {:mdns_lite, "~> 0.8"},
    
    # Process distribution  
    {:horde, "~> 0.9"},
    
    # Messaging
    {:phoenix_pubsub, "~> 2.1"},
    
    # Caching
    {:nebulex, "~> 2.5"},
    
    # Observability
    {:telemetry, "~> 1.2"},
    {:telemetry_metrics, "~> 0.6"},
    
    # Optional advanced features
    {:partisan, "~> 5.0", optional: true},
    
    # Development and testing
    {:mox, "~> 1.0", only: :test},
    {:excoveralls, "~> 0.18", only: :test},
    {:credo, "~> 1.7", only: [:dev, :test]},
    {:dialyxir, "~> 1.4", only: [:dev, :test]}
  ]
end

# test/support/cluster_case.ex
defmodule Foundation.ClusterCase do
  use ExUnit.CaseTemplate
  
  using do
    quote do
      import Foundation.ClusterCase
      import Foundation.TestHelpers
    end
  end
  
  def setup_test_cluster(node_count \\ 3) do
    # Start multiple nodes for integration testing
    nodes = start_test_nodes(node_count)
    setup_foundation_on_nodes(nodes)
    
    on_exit(fn -> cleanup_test_nodes(nodes) end)
    
    %{nodes: nodes}
  end
end

# test/support/test_helpers.ex
defmodule Foundation.TestHelpers do
  def wait_for_cluster_formation(expected_nodes, timeout \\ 5000) do
    # Wait for cluster to stabilize
    wait_until(fn -> 
      Foundation.Cluster.size() == expected_nodes 
    end, timeout)
  end
  
  def simulate_network_partition(nodes_a, nodes_b) do
    # Simulate network partitions for testing
    partition_nodes(nodes_a, nodes_b)
    
    on_exit(fn -> heal_partition(nodes_a, nodes_b) end)
  end
  
  def assert_eventually(assertion, timeout \\ 5000) do
    # Assert that something becomes true within timeout
    wait_until(assertion, timeout)
    assertion.()
  end
end

# mix.exs - Just add Foundation
{:foundation, "~> 2.0"}

# lib/my_app/application.ex
defmodule MyApp.Application do
  def start(_type, _args) do
    children = [
      # Foundation automatically handles clustering in development
      {Foundation, []},
      
      # Your services work distributed automatically
      MyApp.UserService,
      MyApp.OrderService,
      MyApp.Web.Endpoint
    ]
    
    Supervisor.start_link(children, strategy: :one_for_one)
  end
end

# Start multiple nodes for development
# iex --name dev1@localhost -S mix
# iex --name dev2@localhost -S mix
# Foundation automatically discovers and connects them via mdns_lite

# config/prod.exs
config :foundation,
  cluster: :kubernetes  # That's it!

# Foundation automatically:
# - Configures libcluster with Kubernetes strategy
# - Sets up Horde for distributed processes
# - Enables Phoenix.PubSub for messaging
# - Configures Nebulex for distributed caching
# - Provides health checks and monitoring

# config/prod.exs
config :foundation,
  profile: :enterprise,
  clusters: %{
    # Web tier
    web: [
      strategy: {Cluster.Strategy.Kubernetes, [
        mode: :hostname,
        kubernetes_selector: "tier=web"
      ]},
      services: [:web_servers, :api_gateways],
      messaging: [:user_events, :api_requests]
    ],
    
    # Processing tier  
    processing: [
      strategy: {Cluster.Strategy.Kubernetes, [
        kubernetes_selector: "tier=processing"
      ]},
      services: [:background_jobs, :data_processors],
      messaging: [:job_queue, :data_events]
    ],
    
    # AI tier
    ai: [
      strategy: {Cluster.Strategy.Consul, [
        service_name: "ai-cluster"
      ]},
      services: [:ai_workers, :model_cache],
      messaging: [:inference_requests, :model_updates]
    ]
  }

# lib/my_app/user_service.ex
defmodule MyApp.UserService do
  use GenServer
  
  def start_link(opts) do
    # Foundation makes this automatically distributed
    Foundation.ProcessManager.start_distributed_process(
      __MODULE__, 
      opts,
      strategy: :singleton,  # One instance across entire cluster
      cluster: :web
    )
  end
  
  def process_user(user_id) do
    # Foundation handles service discovery and routing
    Foundation.Messaging.send_message(
      {:service, :user_service},
      {:process_user, user_id}
    )
  end
end

# Distributed debugging across Foundation cluster
defmodule MyApp.DebuggingExample do
  def debug_distributed_request(request_id) do
    # ElixirScope + Foundation = distributed debugging magic
    Foundation.Context.with_context(%{
      request_id: request_id,
      debug_session: ElixirScope.start_debug_session()
    }) do
      
      # Process request across multiple services/nodes
      user = Foundation.call_service(:user_service, {:get_user, user_id})
      order = Foundation.call_service(:order_service, {:create_order, user, items})
      
      # ElixirScope automatically traces across all nodes
      ElixirScope.complete_trace(request_id)
    end
  end
end

# Leverage Foundation for distributed AI optimization
defmodule MyApp.AIOptimization do
  def optimize_model_across_cluster() do
    # DSPEx + Foundation = distributed AI optimization
    program = create_base_program()
    dataset = load_training_dataset()
    metric = &accuracy_metric/2
    
    # Foundation automatically distributes across AI cluster
    optimized_program = Foundation.AI.distribute_optimization(
      DSPEx.BootstrapFewShot,
      program,
      dataset, 
      metric,
      cluster: :ai,
      max_workers: Foundation.Cluster.node_count(:ai) * 4
    )
    
    # Result is automatically cached across cluster
    Foundation.Cache.put("optimized_model_v#{version()}", optimized_program)
    
    optimized_program
  end
end

# Before: Manual libcluster setup
config :libcluster,
  topologies: [
    k8s: [
      strategy: Cluster.Strategy.Kubernetes,
      config: [
        mode: :hostname,
        kubernetes_node_basename: "myapp",
        kubernetes_selector: "app=myapp"
      ]
    ]
  ]

# After: Foundation orchestration
config :foundation,
  cluster: :kubernetes  # Foundation handles the rest
  
# Migration helper
Foundation.Migration.from_libcluster(existing_libcluster_config)

# Before: Swarm registration
Swarm.register_name(:my_process, MyProcess, :start_link, [args])

# After: Foundation process management  
Foundation.ProcessManager.start_distributed_process(
  MyProcess,
  args,
  name: :my_process,
  strategy: :singleton
)

# Migration helper
Foundation.Migration.from_swarm(existing_swarm_processes)

# Before: Manual distribution setup
children = [
  {Phoenix.PubSub, name: MyApp.PubSub},
  {Registry, keys: :unique, name: MyApp.Registry},
  MyApp.Worker
]

# After: Foundation orchestration
children = [
  {Foundation, []},  # Handles PubSub, Registry, clustering
  MyApp.Worker      # Automatically gets distributed capabilities
]

# lib/foundation/health_monitor.ex
defmodule Foundation.HealthMonitor do
  def cluster_health_check() do
    %{
      cluster_status: check_cluster_status(),
      node_health: check_all_nodes(),
      service_health: check_all_services(),
      performance_metrics: get_performance_summary(),
      recommendations: generate_health_recommendations()
    }
  end
  
  defp check_cluster_status() do
    %{
      expected_nodes: Foundation.Config.get(:expected_nodes),
      actual_nodes: Foundation.Cluster.size(),
      partitions: detect_network_partitions(),
      last_topology_change: get_last_topology_change()
    }
  end
end

# Web endpoint for health checks
# GET /health -> Foundation.HealthMonitor.cluster_health_check()

# lib/foundation/performance_monitor.ex
defmodule Foundation.PerformanceMonitor do
  def collect_cluster_metrics() do
    %{
      message_throughput: measure_message_throughput(),
      service_latency: measure_service_latencies(),
      resource_utilization: measure_resource_usage(),
      cache_hit_rates: measure_cache_performance(),
      horde_sync_times: measure_horde_performance()
    }
  end
  
  def performance_dashboard() do
    # Real-time performance dashboard
    metrics = collect_cluster_metrics()
    trends = analyze_performance_trends()
    alerts = check_performance_alerts()
    
    %{
      current_metrics: metrics,
      trends: trends,
      alerts: alerts,
      recommendations: generate_performance_recommendations(metrics)
    }
  end
end

# lib/foundation/disaster_recovery.ex
defmodule Foundation.DisasterRecovery do
  def backup_cluster_state() do
    %{
      cluster_topology: Foundation.Cluster.get_topology(),
      service_registry: Foundation.ServiceMesh.export_registry(),
      process_state: Foundation.ProcessManager.export_state(),
      configuration: Foundation.Config.export_config()
    }
  end
  
  def restore_cluster_state(backup) do
    # Restore cluster from backup
    Foundation.Cluster.restore_topology(backup.cluster_topology)
    Foundation.ServiceMesh.import_registry(backup.service_registry)
    Foundation.ProcessManager.restore_state(backup.process_state)
    Foundation.Config.import_config(backup.configuration)
  end
  
  def failover_to_backup_cluster(backup_cluster_config) do
    # Automatic failover to backup cluster
    current_state = backup_cluster_state()
    connect_to_backup_cluster(backup_cluster_config)
    restore_cluster_state(current_state)
  end
end